/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/NiagaraParameterDefinitionsSubscriberViewModel.h
Find the parameter owned by the object viewed by theINiagaraParameterDefinitionsSubscriberViewModeland set its overriding state with a valid Parameter Definitions if possible. If set to no longer override, synchronize it immediately.
void SetParameterIsOverridingLibraryDefaultValue ( const [FGuid](API\Runtime\Core\Misc\FGuid) & ScriptVarId, bool bIsOverriding )